段国勇,罗文庆,徐广超,李森

• 1:三峡大学电气与新能源学院
• 2:湖北省输电线路工程技术研究中心(三峡大学)
• 3:三峡大学三峡库区地质灾害教育部重点实验室
• 4:华中科技大学环境科学与工程学院

摘要(Abstract)：

【目的】泥岩遇水易发生膨胀崩解甚至泥化，对输电杆塔基础抗拔承载力造成不良影响，需要对渗水作用下杆塔基础的抗拔承载特性展开研究。【方法】基于泥岩室内试验结果，利用有限元软件建立泥岩中扩底基础计算模型，引入温度场比拟湿度场的方法模拟泥岩地基浸水后的膨胀劣化，研究扩底基础上拔承载特性。在此基础上，分析泥岩地基浸水渗透后扩底基础极限抗拔承载力降低的具体原因；比较了泥岩地基天然状态、浸水渗透和饱和状态三种工况下极限抗拔承载力的差异以及承载力与埋深之间的关系。【结果】结果表明：增加基础埋深均能提高极限抗拔承载力，但饱和状态工况下增长最缓慢；地基浸水渗透对基础极限抗拔承载力的影响随着基础埋深增加而减弱，2.0 m埋深基础极限抗拔承载力仅为天然状态工况的63.2%,而5.0 m埋深时达到94.2%。【结论】地基浸水造成基础极限抗拔承载力降低的主要原因是地基力学参数劣化，抗剪强度减小所致。研究成果可为泥岩地区杆塔基础设计提供参考。

关键词(KeyWords)： 泥岩;抗拔承载力;扩底基础;数值模拟;温度场

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(U2034203)

作者(Author): 段国勇,罗文庆,徐广超,李森

DOI: 10.13928/j.cnki.wrahe.2024.02.010

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